This report takes a look at the world’s top 20 largest economies that have the highest external debt-to-GDP ratio, calculated using the most recent numbers (Q3 2011) from the World Bank expressed in percentages.

External debt is a measure of a total debt in a country that is owed to creditors outside that country; foreign liabilities, capital plus interest that the government, institutions and people within a nation’s borders must eventually pay. In short, this number extends beyond simply government debt, but also debt owed by corporations and individuals.

Source: External debt information from The World Bank, GDP information from the CIA World Factbook.

Child-murderer,
torture-killer, and rapist known as "La Bestia" ("The
Beast"). Convicted of killing 138 victims but suspected of murdering over
400 victims, mostly street children. Sentenced to 1,853 years but could only be
imprisoned for 30 which was reduced to 22 after aiding investigators.

2. Pedro Alonso López

Proven Victims: 110

Possible Victims: 310 - 350+

Country: Colombia, Peru, Ecuador

Years Active: 1969 to 1980

Child-murderer
and rapist, known as "The Monster of the Andes". Targeted young
girls, between the ages of 8 and 12. Arrested in 1980 and convicted in 1983 of
killing 110 young girls but confessed to killing 300, exact total unknown.
Though he may be the most prolific serial killer of the 20th century, he was
released in 1998. Current whereabouts unknown.

3. Daniel
Barbosa

Proven Victims: 72

Possible Victims: 150

Country: Colombia, Ecuador

Years Active: 1974 to 1986

Child-murderer,
believed to have possibly raped and killed over 150 victims, primarily young
virgin girls. Confessed to killing 72 victims and incarcerated with Pedro
Alonso Lopez. Considered to be intelligent and believed to have been motivated
to kill from his stepmother abusing him as a child. He strangled young girls in
Colombia and was arrested, but he escaped from prison and he started killing in
Ecuador; rearrested in 1989, he was killed in jail.

4. Pedro
Rodrigues Filho

Proven Victims:

71

Possible Victims:

100+

Country:

Brazil

Years Active: 1967 to 2003

Convicted
and sentenced to 128 years, but the maximum one can serve in Brazil is 30
years. He has claimed to have killed over 100 victims, 47 of them inmates. He
also killed his father and ate a piece of his heart. He killed his first two
victims at the age of 14; he was first arrested in 1973.

5. Gary
Ridgway

Proven Victims:

71

Possible Victims:

71–90+

Country:

United States

Years Active: 1982 to 2000

Truck
painter who confessed to killing 71 women. The United States' most prolific
serial killer; also known as The Green River Killer. He almost exclusively
targeted escorts from Seattle. Once there, he would proposition a prostitute,
drive to the banks of the Green River, and strangle her to death. After
murdering his victim he would dump her body near the nearby water. Suspected of
killing over 90 victims, confessed to 71, convicted of 48.

6. Yang
Xinhai

Proven Victims:

67

Possible Victims:

67

Country: China

Years Active: 2000 to 2003

Would
enter victims' homes at night and kill everyone with axes, meat cleavers,
hammers, and shovels. Executed in February 2004. Known as the "Monster
Killer".

7. Andrei
Chikatilo

Proven Victims:

53

Possible Victims: 56

Country:

Soviet Union/Ukraine

Years Active: 1978 to 1990

Known
as Butcher of Rostov, The Red Ripper or The Rostov Ripper. Convicted of the
murder of 53 women and children between 1978 and 1990. Executed in 1994. Three
people were previously convicted and executed for his crimes.[7]

8. Anatoly
Onoprienko

Proven Victims:

52

Possible Victims:

52+

Country:

Soviet Union/Ukraine

Years Active: 1989 to 1996

Known
as "The Beast of Ukraine", "The Terminator" and
"Citizen O". Convicted of the murders of 9 people in 1989 and 43
people in 1995–1996. Sentenced to death, later commuted to life. Traveled
through Europe illegally from 1990 to 1995; whether he killed during this time
is unknown.

9. Alexander
Pichushkin

Proven Victims:

48

Possible Victims:

61+

Country:

Russia

Years Active: 1992 - 2006

Known
as the Chessboard Killer. Convicted of murdering 48 victims and suspected of
killing 61. Claimed to have murdered 63 people out of his goal of 64 to fill a
chessboard; stated goal of becoming Russia's most prolific serial killer.

10. Ahmad
Suradji

Proven Victims:

42

Possible Victims:

70–80+

Country:

Indonesia

Years Active: 1986 to 1997

Convicted
of strangling at least 42 women and girls in a series of ritual slayings he
believed would give him magical powers. Executed by firing squad on 11 July
2008.

11. Moses
Sithole

Proven Victims:

38

Possible Victims:

38+

Country:

South Africa

Years Active: 1994 to 1995

Preyed
on unemployed women, posing as a businessman and luring his victims with the
prospects of a job, before leading them to an isolated place, where he raped,
tortured, and murdered them. Sentenced to 2410 years imprisonment with a
non-parole period of 930 years. Known as South Africa's Ted Bundy.

12. Serhiy
Tkach

Proven Victims:

36

Possible Victims:

80–100

Country:

Soviet Union/Ukraine

Years Active: 1984 to 2005

A
former Ukrainian police criminal investigator, suffocated girls aged between 8
and 18 and performed sexual acts on their bodies after they were dead. Claims
to have killed 100.

13. Gennady
Mikhasevich

Proven Victims:

36

Possible Victims:

38–43

Country:

Soviet Union

Years Active: 1971 to 1985

Strangled
females.

14. John
Wayne Gacy

Proven Victims:

33

Possible Victims:

33

Country:

United States

Years Active: 1972 to 1978

The
"Killer Clown" who primarily preyed on young men and frequently raped
his victims. He buried them under his Chicago home. Executed in 1994.

15. Vera
Renczi

Proven Victims:

32

Possible Victims:

35

Country:

Romania

Years Active: 1920 to 1930

Convicted
of killing 35 men through arsenic poisoning but confessed to only killing 32
victims.

16. Karl
Denke

Proven Victims:

31

Possible Victims:

40+

Country:

German Reich

Years Active: 1900 to 1924

Cannibal
mainly targeting travellers, probably striking them with an axe.

17. Ted
Bundy

Proven Victims:

30

Possible Victims:

36+

Country:

United States

Years Active: 1974 to 1978

America's
first "post-modern" serial killer due to his charisma and good looks.
Bundy officially confessed to 30 homicides, but he is suspected of at least 36,
and upwards of 100 or more by some estimates. Infamous for escaping from prison
twice and murdering multiple victims in one day, sometimes abducting women from
the same location within hours of one another. He was executed in the electric
chair in 1989.

18. H.
H. Holmes

Proven Victims:

27

Possible Victims:

200+

Country:

United States

Years Active: 1886

Was
one of the first documented American serial killers in the modern sense of the
term. In Chicago, at the time of the 1893 World's Fair, Holmes opened a hotel,
which he had designed and built for himself specifically with murder in mind,
and which was the location of many of his murders.

19. Maoupa
Cedric Maake

Proven Victims:

27

Possible Victims:

35+

Country:

South Africa

Years Active: 1996 to 1997

Known
as the "Wemmer Pan Killer" and "Hammer Killer". He killed
his victims with different instruments such as: guns, rocks, a knife and a
hammer. Authorities attributed the murders to two serial killers because of the
Modus Operandi. In some cases he killed his victims with a rock, in others he
shot them, and in others he murdered tailors with a hammer. Maake was arrested
after Moses Sithole was found guilty of 38 killings and sentenced to 27 life
sentences and 1159 years which amounted to 1,340 years all together.

20. Juan
Vallejo Corona

Proven Victims:

25

Possible Victims:

25+

Country:

United States

Years Active: 1971

Corona
was convicted of murdering ranch laborers and burying them in orchards. He was
sentenced to 25 terms of life imprisonment.

This part of the list contains all serial killers with at least 15 proven victims that acted alone and were neither medical professionals nor contract killers.